first lady michelle obama, biking with her family today on martha's vineyard. and opening up to parade magazine about raising 15- year-old malia and 12-year- old sasha "what i tell my kids is, i'm preparing you for college and for life. so, having independence, knowing how to set your own boundaries, that balance." asked about these comments to cnn affiliate wcax. >>as a busy single mother - or i shouldn't say single - as a busy mother. the first lady told parade "i give my husband credit - he knows who their friends are, he knows what their schedule is. but he's not making the calls to the dance studio to figure out what classes they're taking next year." mrs obama has also made a point of promoting healthy eating - with her own white house garden. and exercise -- often serving as first example -- natpop from first lady vs fallon video? taking on jimmy fallon in a fitness battle to kids and the coveted cover model is not above a little vanity as she approaches 50 >>"i have never felt more confident in myself, more clear on who i am as a woman.i want to be this